L98 with mild bolt-ons dyno
03-15-2011, 10:06 PM
#1
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Car: 1982 Z28
Engine: LC9
Transmission: AR5
Axle/Gears: 3.23
L98 with mild bolt-ons dyno
Had PF Tuning in Virginia Beach build a Megasquirt system (I suck at electronics 
) for my Camaro and finally got around to getting it dyno tuned today. My car has an L98 from an '89 FBody and since I "just" autocross it, not much can be done motor-wise for the class it's in -- headers and exhaust are free, as is the intake, but all the engine internals must be stock specs. I just have a stock manifold and upper plenum with siamesed runners (Edelbrock? SLP?), 52mm throttle body with airfoil, and Headman headers that go into a single Flowmaster muffler. Oh it has a T10 transmission.
Anyway, it did 248/344 on a dynojet. After tinkering with the AF ratio with "safe" timing, it was around the 230's/330's range, and then got up to those final numbers with more timing. For autocross, the car is basically in the 2500-4500 RPM range in second gear for most of a run, and it looks like a pretty good power curve in that range (I'll post a sheet tomorrow).
I imagine there's still more to be had with a different intake manifold, but I'm not sure what would be best for more power down low.
First autocross is in two weeks, and I'm stoked!
Pat
) for my Camaro and finally got around to getting it dyno tuned today. My car has an L98 from an '89 FBody and since I "just" autocross it, not much can be done motor-wise for the class it's in -- headers and exhaust are free, as is the intake, but all the engine internals must be stock specs. I just have a stock manifold and upper plenum with siamesed runners (Edelbrock? SLP?), 52mm throttle body with airfoil, and Headman headers that go into a single Flowmaster muffler. Oh it has a T10 transmission.Anyway, it did 248/344 on a dynojet. After tinkering with the AF ratio with "safe" timing, it was around the 230's/330's range, and then got up to those final numbers with more timing. For autocross, the car is basically in the 2500-4500 RPM range in second gear for most of a run, and it looks like a pretty good power curve in that range (I'll post a sheet tomorrow).
I imagine there's still more to be had with a different intake manifold, but I'm not sure what would be best for more power down low.
First autocross is in two weeks, and I'm stoked!
Pat
03-17-2011, 09:29 AM
#3
Re: L98 with mild bolt-ons dyno
Can you switch to 1.6 rockers? That along with a lower base manifold should help...or atleast a ported stock base. You could see another 10whp easily, but those numbers are really good for stock base.
My stealth ram swapped motor running lean on the dyno made 254whp/315wtq. TPI always out torques it but couldnt match the rpm power the short runner intake put out. My friends bolt on TPI car ran just as strong as my car did, so I think he was right there with me in power.
My stealth ram swapped motor running lean on the dyno made 254whp/315wtq. TPI always out torques it but couldnt match the rpm power the short runner intake put out. My friends bolt on TPI car ran just as strong as my car did, so I think he was right there with me in power.
03-17-2011, 10:07 AM
#4
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Join Date: Sep 2002
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Car: 1982 Z28
Engine: LC9
Transmission: AR5
Axle/Gears: 3.23
Re: L98 with mild bolt-ons dyno
My stealth ram swapped motor running lean on the dyno made 254whp/315wtq. TPI always out torques it but couldnt match the rpm power the short runner intake put out. My friends bolt on TPI car ran just as strong as my car did, so I think he was right there with me in power.
Pat
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